CN100344073C - Adaptive pilot interference cancellation in CDMA systems - Google Patents
Adaptive pilot interference cancellation in CDMA systems Download PDFInfo
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- CN100344073C CN100344073C CNB038203588A CN03820358A CN100344073C CN 100344073 C CN100344073 C CN 100344073C CN B038203588 A CNB038203588 A CN B038203588A CN 03820358 A CN03820358 A CN 03820358A CN 100344073 C CN100344073 C CN 100344073C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
- H04B1/71075—Parallel interference cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
- H04B1/712—Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
Abstract
A system and method for interference reduction in a spread spectrum receiver including a rake receiver having a plurality of fingers for processing a plurality of data signals and an associated plurality of pilot signals is disclosed herein. The method includes generating a plurality of intra-finger interference cancellation signals using the plurality of pilot signals. In this regard each of the plurality of intra-finger interference cancellation signals are associated with one of the plurality of fingers. Ones of the plurality of intra-finger interference cancellation signals are weighted so as to generate a set of weighted intra-finger interference cancellation signals. The method further includes synthesizing at least one inter-finger interference cancellation signal in accordance with the set of weighted intra-finger cancellation signals. At least one inter-finger cancellation signal may then be subtracted from a corresponding one of the plurality of data signa
Description
Technical field
The present invention relates to code division multiple access (CDMA) communication system, specifically, relate to the technology of the pilot signal interference in this system of elimination.
Background technology
At present, the standardization of various types of code division multiple accesss (CDMA) wireless communication system, and be applied in many countries.More particularly, this class standard comprises IS-95, CDMA2000 and WCDMA.In cdma system, different sign indicating number sequences of being distributed by use between the user are distinguished mutually.
In cdma system, usually by transmitter emission " pilot tone " signal, so that the various processing eases of receiver end carry out.For example, receiver can utilize this pilot signal to set up and the sequential of transmitter and Frequency Synchronization, the estimation characteristic of channel, and impels the consistent demodulation of transmission data.Usually each pilot signal that is associated with certain base station is unique, so that travelling carriage can identify this base station by the pilot signal that receives.By being different side-play amount of each base station assigns, the base station uses this side-play amount to generate its PN sequence, just can obtain this association.The generation of pilot signal normally utilizes a known known data pattern of Walsh sign indicating number " covering " (pattern), and utilizes this result of known pseudo noise (PN) sequence spread spectrum to realize.
In the cdma system, dispose the Rake receiver that is used to implement diversity receiving technology usually, so that from the signal energy that channel receives, extract pilot signal, user service data and other data.Each of Rake receiver " interdigital " or diversity branch are handled the multipath component (component) of distributing to it, and recover relevant pilot signal, user service data and other data.The pilot information of recovering generally is used to estimate the characteristic of channel (for example, amplitude and phase place), and this is being necessary for consistent the detection in Rake receiver.Usually, produce pilot signal and be for the spreading code quadrature of distributing to system user disturb so that in the data demodulates processing procedure, do not occur.Yet under the multipath channel situation of disperseing, the various multi-path signal-components that receive may be also nonopiate each other, thereby cause undesirable interference.What all can have some influences because pilot signal is generally to transmission signals, and therefore the multipath that is caused by nonopiate weight of pilot frequency disturbs the performance that will reduce receiver.
Therefore, need a kind of technology that can in diversity receiver, eliminate the multipath pilot signal interference.
Summary of the invention
Put it briefly, on the one hand, the present invention relates to a kind of method that reduces the interference in the band spread receiver, described band spread receiver comprises the Rake receiver, and the latter has and is used to handle a plurality of interdigital of a plurality of data-signals and a plurality of relevant pilot signal.Described method comprises uses a plurality of pilot signals to produce a plurality of interdigital interior interference cancellation signals.In this regard, a plurality of interdigital in the interference cancellation signals each all with a plurality of one of interdigital being associated.Each of a plurality of interdigital interior interference cancellation signals all passed through weighting, so that produce the interdigital interior interference cancellation signals of one group of weighting.Method of the present invention also comprises the interdigital interior erasure signal according to this group weighting, synthetic at least one inter-finger interference cancellation.Then, at least one inter-finger cancellation signal can deduct in the corresponding signal from a plurality of data-signals.
On the other hand, the present invention relates to a kind of method that reduces the interference in the band spread receiver, described band spread receiver comprises the Rake receiver, and it is individual interdigital that the latter has the N that is used to handle N data-signal and N relevant pilot signal.Described method comprises utilizes relevant pilot signal to produce N interdigital interior interference cancellation signals.In this regard, N interdigital in the interference cancellation signals each interdigital being associated in all interdigital with N.N interdigital interior interference cancellation signals all passed through weighting, so that produce the interdigital interior interference cancellation signals of N weighting.This method also comprises synthetic N inter-finger interference cancellation.Each signal in N inter-finger cancellation signal all is one or more and synthetic according in the interference cancellation signals in N weighting interdigital.In addition, each signal in N inter-finger interference cancellation all deducts in the corresponding signal from N data-signal, has reduced the data-signal that disturbs thereby produce N, determines the described degree that has reduced residual interference in the data-signal that disturbs.
Another aspect the present invention relates to a kind of band spread receiver of the Rake of being embedded with receiver, and it is individual interdigital that described Rake receiver has the N that is used to handle N data-signal and N relevant pilot signal.During N is interdigital each is interdigital all be provided with one interdigital in interference cancellation module, it is configured to use N at least one signal in the relevant pilot signal, produces interdigital interior interference cancellation signals.Described receiver also comprises inter-finger interference cancellation module, is used for synthetic N inter-finger interference cancellation.Each signal in N inter-finger cancellation signal all according to one group interdigital in interference cancellation signals synthetic.Described inter-finger interference cancellation module comprises: (i) gain adjusting unit, be used for the interdigital interior erasure signal of weighting, so that produce the interdigital interior erasure signal of a plurality of weightings, (ii) adder unit, be used for merging some signals of erasure signal in a plurality of weightings interdigital, reach (iii) interference eliminated authentication ' unit, be used for determining described N degree that has reduced residual interference in the data-signal that disturbs.
Description of drawings
In order to deepen understanding, by embodiment the present invention is described in further details below in conjunction with accompanying drawing to feature of the present invention.In the accompanying drawing:
Fig. 1 is the block diagram that can implement the conventional mobile device receiver of adaptive pilot interference cancellation techniques of the present invention therein;
Fig. 2 is the block diagram that is incorporated into the traditional Rake receiver module in the mobile device receiver of Fig. 1;
Fig. 3 is the block diagram according to Rake receiver module of the invention process;
Fig. 4 provides the high level block diagram of interference cancellation module in configuration in each finger processor of Rake receiver of Fig. 3 interdigital;
Fig. 5 is the high level block diagram that is incorporated into the inter-finger interference cancellation module in the Rake receiver of Fig. 3;
Fig. 6 provides the detailed maps of interdigital interior interference cancellation module;
Fig. 7 is the part schematic diagram of the signal gain adjustment and the subsystem summation of inter-finger interference cancellation module shown in Figure 5;
Fig. 8 is the part schematic diagram of the interference eliminated authentication ' unit of inter-finger interference cancellation module;
Figure 9 shows that the detail drawing a kind of in the cards of interference eliminated authentication ' unit;
Figure 10 shows that the flow chart of interference eliminated verification process of the present invention;
Figure 11 shows that the schematic diagram of a kind of specific implementation of AIC PS/CPICH signal regeneration module.
Embodiment
The present invention relates to self adaptation and eliminate the method and system of the interference in the CDMA signal that receives, this interference is owing to existing the pilot energy relevant with each multipath component to cause.In the WCDMA system environments, can adopt the present invention to realize that self adaptation eliminates the known Common Pilot Channel (CPICHs) in a plurality of multipath components be present in the received signal.Adaptive disturbance described herein is eliminated (AIC) processing procedure and can preferably be adopted the simplest method to realize.In addition, subscriber equipment is known the information content and the structure in the pilot channel that will be eliminated by reasoning.Reduce the complicated method that data channel disturbs with respect to being used to, this method can make execution mode be simplified.
In the CDMA signal that receives, generally include a plurality of multipath components, wherein each multipath component is handled by a relevant cdma receiver " interdigital " respectively.Concerning a given multipath component, the undesirable signal that all can be made of it multipath component of other interdigital processing of receiver disturbs.According to the present invention, disturb the relevant channel of pilot signal of multipath component to estimate to each, and produce corresponding channel model.Afterwards, disturb the relevant pilot signal of multipath component, and transmit the pilot signal of regenerating, thereby generate some interdigital interior Pilot Interference erasure signals by these channel models by regeneration and each.Next, according to these interdigital interior Pilot Interference erasure signals, synthetic inter-finger interference cancellation.Then, from the digitlization baseband signal after the interdigital processing of specific receiver, deduct inter-finger interference cancellation,, in this signal, undesirable pilot information is removed basically to produce " purification " signal.Can also adopt the interference eliminated authentication mechanism, so that the strategy that adaptive disturbance is eliminated is implemented, designing this strategy is to be used to reduce the unfavorable result that any potential elimination mistake causes.
Fig. 1 is the block diagram of traditional mobile device receiver 100, and adaptive pilot interference cancellation techniques of the present invention can realize in this equipment.Suppose in mobile device, to be provided with mobile device receiver 100, so that this mobile device can communicate in cdma communication system.Mobile device receiver 100 comprises front-end processing module 104, and it is used for the forward link signal components that reception antenna 105 collects.Forward link signal components is by the emission of cdma communication signal transmitter (not shown), produces by multipath propagation environment arrival mobile device.Usually, the CDMA forward link transmitter is configured to launch to a plurality of user radio platforms the signal of a plurality of channels.Specifically, transmitter is launched the Walsh pilot signal when mobile device sends a plurality of data-signal.Each channel in a plurality of data channels all adopts different Walsh sign indicating numbers to encode, and the Walsh sign indicating number of this Walsh sign indicating number and other data channel and the Walsh sign indicating number of pilot signal are all orthogonal thereto.
With reference to figure 1,104 pairs of forward link signals that receive of front-end processing module carry out filtering, amplification, down-conversion and digitized processing again, offer Rake receiver module 110 to produce the sampling of data 106 that a winding receives.During work, the sampling of data 106 that Rake receiver module 110 is used for providing according to front-end processing module 104 produces and recovers symbol.
Rake receiver module 110 is configured to handle a plurality of components of the received signal that receives by different signalling channels or " multipath ".Known to the insider, under the situation of interference that is not subjected to other user or interference minimum, the Rake receiver provides the optimum structure of received signal from multi-path environment.The detailed description of relevant Rake receiver principle can be with reference to following treatise: " anti-multipath technology of spread spectrum and the application introduction in the city digital radio communication thereof ", author G.L.Turni, IEEE journal, Vol.65, No.3,328-353 page or leaf, in March, 1980; And " digital communication ", author J.G.Proakis; Wheat Grosz that international publishing company (McGraw-Hill), 1989.
Below with reference to Fig. 2, wherein shown the block diagram of traditional Rake receiver module 110.Rake receiver module 110 comprises a plurality of diversity treatment channel 214, or title " interdigital " processor 214, digitized processing is carried out in 214 pairs of data sampling 106 of each finger processor, and sampling of data 106 is corresponding to an example of the forward link signal that receives on such signalling channel.The specific multipath component of each finger processor 214 in to received signal handled.This processing comprises that the time queue that the specific PN sequence of using the user is handled multipath signals according to available finger processor 214 comes despread data sampling 106.The candidate symbol streams that obtains from finger processor 214 offers diversity synthesis module 218; Diversity synthesis module 218 synthetic single composite symbol on the basis of these candidate symbols streams flows.Receive 222 receptions of (RX) data processor and decoding composite symbol stream, so that recover forward link transmitting users data and information from diversity synthesis module 218.
As mentioned above, each finger processor 214 is used for demodulation and handles the forward link signal that receives from the different air traffic channel of multipath propagation environment.The structure of each finger processor 214 is identical basically, but its processing procedure is to carry out according to the different parameters characteristic (as gain, phase place and time-delay) of the air traffic channel that is associated with it.Rake receiver module 110 also comprises pilot searcher 210, is used for detecting the various multipath component of the pilot signal that receives.This search is to utilize known technology, with the PN sequence cross-correlation of received signal with relevant pilot signal, thereby detects the signal of different base station emission and multipath component wherein.Pilot searcher 210 offers the detected PN signal bias amount relevant with each multipath component and is assigned the finger processor 214 that is used to handle this multipath component.The particular channel that the phase reference that is provided by the pilot signal that is detected can make 214 pairs of each finger processor the multipath signal distortion occur carries out consistent demodulation.
The front illustrates the various traditional structure and the course of work of Rake receiver.Focus on below the exemplary embodiment of adaptive pilot interference elimination treatment process of the present invention is described.
Fig. 3 has shown the block diagram of Rake receiver module 310 of the present invention.Rake receiver module 310 comprises a plurality of finger processor 314, and digitized processing is carried out in 314 pairs of data sampling 306 of each finger processor, and sampling of data 306 is with corresponding from the forward link signal that the base station (not shown) receives by a particular channel.Each finger processor 314 is handled specific multipath component in the received signal.Such processing comprises the specific PN sequence of using the user, and the time queue of handling multipath signal according to available finger processor 314 comes despread data sampling 306.The candidate symbol streams that obtains from finger processor 314 offers diversity synthesis module 318, and diversity synthesis module 318 synthetic single composite symbol on the basis of these candidate symbols streams flows.Afterwards, receive 322 receptions of (RX) data processor and decode, to recover forward link transmitting users data and information from the composite symbol stream of diversity synthesis module 318 and to it.Except carrying out the following description of the present invention interference elimination treatment, the function of Rake receiver module 310 is similar basically to traditional Rake receiver module 110.
According to an aspect of the present invention, each finger processor 314 comprises interdigital interior interference eliminated (IC) module 340, and this block configuration becomes and can produce interdigital interior interference eliminated (IC) signal based on the pilot signal component of being handled by this finger processor 314.In addition, Rake receiver module 310 also comprises an inter-finger interference cancellation module 320, and it is in order to produce interdigital interference eliminated (IC) signal according to a plurality of interdigital interior IC signals from finger processor 314.Utilize suitable sequential synchronously each interdigital IC signal to be put on the available finger processor 314, so just can be from that receive, that will handle by finger processor 314, " sordid " or be full of in the base band data sampling 306 interference signals and deduct interdigital IC signal.As a result, produce one and reduced the baseband signal of disturbing, got rid of the pilot energy that is associated with any reception finger processor 314 in this signal fully.
Fig. 4 is the high level block diagram of the interdigital interior interference cancellation module 340 of configuration in each finger processor 314.In the embodiment of Fig. 4, dispose interdigital processing module 340 for use in the WCDMA system, communicating by letter, known WCDMA system utilizes main (P) and assists (S) pilot signal and carry out work.Thereby each finger processor 314 all is subjected to the interference from the secondary common pilot channel of advocating peace (CPICH) energy in each finger processor 314 handled signals.That is, by the different finger processor 314 handled guidance different multipath components of signal frequently of advocating peace, be present in usually in the received signal that is assigned to all finger processor 314 respectively.As described herein, IC module 340 was taught on the basis of signal multipath component frequently at advocating peace of being assigned to by pilot searcher 310 that available finger processor 314 handles in each was interdigital, produces a P-CPICH interdigital in IC signal and the interdigital interior IC signal of S-CPICH.
As shown in Figure 4, the base band data that receives sampling 306 is sent to IC subtraction block 402, and interdigital ten gets that a module 404 is common to produce " purification " one-in-ten sampling stream 406.Specifically, IC subtraction block 402 deducts interdigital the available IC signal 520 that is produced by inter-finger interference cancellation module 320 from sampling of data 306.Next carry out ten and get an operation in module 404, the sampled flows that obtains comprises that " purification " ten get one sampling of data 406, supplies with the different piece of interdigital IC module 340 and finger processor 314 and uses.As shown in the figure, one-in-ten sampling flows 406 P-CPICH processing module 410 and the S-CPICH processing modules 414 that are sent in interdigital the IC module 340.As described below, P-CPICH processing module 410 and S-CIPCH processing module 414 produce advocating peace of receiving respectively and teach the estimation model of channel frequently.When adopting the diversity emission, receive a pair of primary pilot signal and a pair of guidance signal frequently on the mobile device receiver of Rake receiver 310 of the present invention being combined with.In this case, the frequency channel models are taught in first and second of first and second primary pilot channel models of estimating (P-CPICH1,2ChEST) and estimation, and (S-CPICH1 2ChEST) is produced by P-CHPCH processing module 410 and S-CPICH processing module 414 respectively.P-CPICH1,2ChEST and S-CPICH1,2ChEST signal are sent to AIC PS/CPICH signal regeneration module 418 and physical channel processing module 428.As shown in FIG., AIC PS/CPICH signal regeneration module 418 is at P-CPICH1, and 2ChEST model signals and S-CPICH1 produce an interdigital interior IC signal 440 on the basis of 2ChEST model signals.More particularly, in the present embodiment, elder generation generates interdigital interior IC signal of P-CPICH and the interdigital interior IC signal of S-CPICH, and is synthetic in AICPS/CPICH signal regeneration module 418 afterwards, to produce interdigital interior IC signal 440.
Shown in Figure 11 is the schematic block diagram of the specific implementation of AIC PS/CPICH signal regeneration module 418.As shown in the figure, this module 418 comprises teaches channel ovsf code maker 1106 frequently, disposes it in order to produce corresponding to teaching the OVSF sequence of channel frequently.This OVSF sequence is come will teach the difference of frequency channel and subscriber channel and primary pilot channel by 1102 scramblings of PN sequence.The scrambling output of OVSF module 1106 is sent to antenna mode modulator 1110 and auxilliary pilot channel multiplier 1114.Antenna mode modulator 1110 adds additional modulation pattern in the S-CPICH channel, has the operation of the base station S-CPICH signal of two antennas in order to simulation.The output of modulator 1110 links to each other with auxilliary pilot channel multiplier 1120, and S-CPICH2 ChEST model signals also is input to multiplier 1120.Equally, S-CPICH1 ChEST model signals also is input to auxilliary pilot channel multiplier 1114.The emission that S-CPICH2 ChEST and S-CPICH1 ChEST model signals are based on separately by one of two antennas of telepoint base station (not shown) configuration obtains.The result of auxilliary pilot channel multiplier 1114,1120 multiplyings is sent to adder 1124.
As shown in figure 11, module 418 also comprises primary pilot channel scrambled code maker 1130, disposes it and is used for producing and the corresponding PN sequence of primary pilot channel.This PN sequence is by OVSF module 1132 spread spectrums, so that primary pilot channel and subscriber channel are come with guidance channel difference frequently.The output of OVSF module 1132 is sent to antenna mode modulator 1134 and primary pilot channel multiplier 1138.Antenna mode modulator 1134 is increased to the P-CPICH channel with additional modulation pattern, has the operation of the base station (not shown) emission P-CPICH signal of two antennas in order to simulation.The output of modulator 1134 is connected to primary pilot channel multiplier 1142, and P-CPICH2 ChEST model signals also is input to 1142.Equally, P-CPICH1 ChEST model signals is input to primary pilot channel multiplier 1138.The emission that P-CPICH2 ChEST and P-CPICH1 ChEST model signals are based on one of two antennas by disposing on the telepoint base station (not shown) respectively obtains.The result that auxilliary pilot channel multiplier 1138,1142 is carried out multiplying is sent to adder 1124.As shown in FIG., adder 1124 is synthetic with the signal of primary pilot channel multiplier 1138,1142 and 1114,1120 generations of auxilliary pilot channel multiplier, thereby produces interdigital interior IC signal 440.
Get back to Fig. 5, wherein shown the high level block diagram of inter-finger interference cancellation module 320.As shown in the figure, by IC module in each finger processor 314 interdigital 340 produce interdigital in IC signal 440 be sent to the IC signal gain adjustment unit 502 of inter-finger interference cancellation module 320.As will be described below, by interdigital the IC signal 520 that the module 320 of given finger processor 314 produces, be by IC adder 506 by merge one group in advance by IC signal gain adjustment unit 502 be weighted interdigital in IC signal 440 produce.IC signal 440 also is sent to IC authentication module 510 in interdigital, and this IC authentication module 510 is used for verification and gets the degree that a sampling of data 406 is disposed pilot channel content undesirable, that be associated with other finger processor 314 from " purification " ten of given finger processor 314.In the present embodiment, IC authentication module 510 is not that each interdigital interior IC signal 440 is carried out authentication operation continuously, but handles these signals successively in the mode of " taking turns ".
Fig. 6 is the detail drawing of interdigital interior IC module 340.As shown in the figure, interdigital ten get a module 404 (being designated as 304 among the figure) comprise ten get a control module 604 (being designated as 504 among the figure) and on time (on-time) ten get a module 608 (being designated as 508 among the figure).In operating process, get one-in-ten samplings that a module 404 produces by interdigital ten and spread and deliver to P-CPICH processing module 410 and S-CPICH processing module 414. Processing module 410 and 414 detects P and the S pilot channel components in the one-in-ten sampling stream (with the ratio of a sampling of every chip (chip)) respectively, and the air interface that receives P and S pilot channel components is respectively carried out channel estimating.Specifically, channel estimating can be finished by the filter that the waveform that one-in-ten sampling stream is flow through with the P pilot signal is complementary by P-CPICH processing module 410.Equally, S-CPICH processing module 414 is carried out channel estimating by one-in-ten sampling stream being flow through the filter that is complementary with S pilot signal waveform.By comparing through filtered pilot signal and known P and S pilot signal are duplicated sample, processing module 410 and 414 can estimate the amplitude and the phase place of P and S pilot channel respectively, and produces corresponding channel model.As shown in FIG., processing module 410 and 414 channel estimating that produce are sent to channel estimating multiplexer 616.
Utilizing processing module 410 and 414 channel models that produce (is P-CPICH1,2ChEST and S-CPICH1,2ChEST), AIC PS/CPICH signal regeneration module 418 produces available interdigital interior IC signal 440 by the pilot channel components regeneration that available finger processor 314 was handled.Specifically, known P and S pilot signal duplicate sample each all by suitable channel model, with form available interdigital in the P of IC signal and the pilot signal component of S regeneration.In the present embodiment, AIC PS/CPICH signal regeneration module 418 comprises and can generate this known P and the transmitter part (for example, spread spectrum and scrambling module) of S pilot signal.
Fig. 7, the signal gain adjustment of inter-finger interference cancellation module 340 and the part schematic diagram of addition subsystem 700 are discussed now.Subsystem 700 comprises IC signal gain adjustment unit 502, IC adder 506 and IC authentication module 510.As shown in FIG., signal gain adjustment unit 502 comprises a plurality of IC gain units 706, to be used for adjusting according to predetermined amplitude weight function the gain of interdigital interior IC signal 440.In the present embodiment, on the confidence level basis that this signal has been confirmed by IC authentication module 510, the amplitude weight function is that each interdigital interior IC signal 440 is composed a weighted value., undesirable pilot energy 314 that be associated based on 314 pairs of given finger processor and other finger processor lack degree, IC authentication module 510 is that IC signal 440 distributes a confidence value in it interdigital.Next, the confidence value of confirming according to IC authentication module 510: 0,1,2,4,8,16, for IC gain unit 706 is provided with suitable gain setting value.The interdigital interior IC signal 440 that " 0 " gain setting value representation can be used should be got rid of from interdigital the IC signal that is generated by IC adder 506.Other each gain setting value be by with described interdigital in the I of IC signal and Q component multiply by given gain factor and use.
As mentioned above, 506 pairs of all interdigital interior IC signals 440 of IC adder carry out add operation, so that produce a different set of interdigital IC signal, it eliminates undesirable Common Pilot Channel interference finger processor 314 usefulness.In the present embodiment, each finger processor 314 be configured to can with provided interdigital in the timing of IC signal 440 be controlled in the resolution of sampling rate.Next, the interdigital interior IC signal 440 that comes out from each finger processor 314 arrives IC adder 506 with different sample instances (in a chip period).That is to say that IC adder 506 needs to send out counts the sample that can regulate between the interdigital interior IC signal 440 poor, this sample difference is relevant with the generation of interdigital IC signal 520 on will being assigned to all finger processor 314.For this reason, IC adder 506 is got the chip duration " snapshot " of all interdigital interior IC signals 440, thereby with interdigital the IC signal 520 of available sampling rate generation corresponding to each finger processor 314.In the present embodiment, IC adder Module 506 produces one 9 numeral, and it will shorten by carrying out a viewport zoom function, and like this, output is six (6) least significant bit (LSBs) just.In case on IC adder 506, produced interdigital given IC signal 520, just it is distributed to available finger processor 314, so that eliminating, above-mentioned Pilot Interference can implement at this.
Shown in Figure 8 is the part schematic diagram of IC authentication module 510.In certain embodiments, to the interdigital interior IC signal 440 of each finger processor 314, the IC authentication processing can be to carry out continuously.But, tend to cause heavy, unnecessary processing operation burden like this.Therefore, in the embodiment shown in fig. 8, IC authentication module 510 comprises IC authentication multiplexer 810, is used for giving IC authentication ' unit 820 with IC signal allocation in interdigital, and the latter authenticates IC signal in interdigital.More particularly, in the present embodiment, 6 interdigital interior IC signals (representing with 442) that general 6MSB by IC signal 440 in interdigital constitutes are via 820 verifications of IC authentication ' unit.In case IC authentication ' unit 820 is finished the processing to given interdigital interior IC signal 440, cycle counter 830 countings increase, and select next interdigital interior IC signal 440 to be processed subsequently.
For authenticating with the wheel stream mode, IC authentication multiplexer 810 preferably distributes each interdigital interior IC signal.That is,, have only the device 810 that is re-used to be assigned to IC authentication ' unit 820 in the interdigital interior IC signal in arbitrary given time.Such distribution is carried out at the postamble edge of available finger processor 314 usually.IC authentication multiplexer also is applicable to and calculates the gain factor 850 relevant with each finger processor 314.These gain factors 850 are used for authentication processing, and are to calculate by interdigital interior IC signal 440 contents available before and after the pilot tone elimination according to the present invention are compared.Particularly, for given finger processor 314, every frame (adding/subtract relevant interdigital timing offset amount) is calculated a new gain factor, and be applied to this finger processor 314, up to finishing next verification process.
Figure 9 shows that the P-CPICH1 authentication subsystem 900 that is incorporated in the IC authentication ' unit 820.In the present embodiment, the operation of P-CPICH1 authentication subsystem 900 is fully with P-CPICH processing module 410 is identical on time, and the latter is used to estimate channel parameter and received power, and this will discuss in the back.As shown in FIG., P-CPICH1 authentication subsystem 900 comprises descrambling module 904, and wherein, ten of finger processor 314 is got an output 406 and is sent to its input.In descrambling module 904, the phase place of authentic pilot signal is carried out descrambling operation.After the descrambling, utilize chip (chip) accumulator 904 (being 908 shown in the figure) that the signal that obtains is separated spread spectrum, and it is compressed with viewport 912.Afterwards, calculate by 916 pairs of remaining P-CPICH signal energies (this provides the estimation to the undesirable residual pilot energy of being handled by finger processor 314) that will be sent to finger processor 314 of power computation module.
For simplifying execution mode, preferably only consider the P-CPICH1 signal by the IC authentication processing that authentication subsystem 900 is realized.By using P-CPICH1 authentication subsystem 900 to carry out each interdigital interior IC signal 440 of interference cancellation verification process with respect, the effect of interference elimination treatment of the present invention can be estimated one by one interdigitally.Though in the present embodiment, only authenticated the relevant interference eliminated of primary pilot channel, also can thinking advocates peace, and to teach the elimination degree of the energy of frequency channel be identical.Be retained in residual signal power (RSCP) in the signal 406 after the purification of each finger processor 314 by measurement, authentication subsystem 900 examine a certain given, disturb according to Common Pilot Channel in the finger processor 314 of pilot tone removing method of the present invention work and whether successfully to be eliminated.In the present embodiment, what the amplitude of the authentication result signal that authentication subsystem 900 produces and pilot tone were eliminated processing becomes the work factor variation that is inversely proportional to, that is, according to detect with given interdigital in the reducing of Common Pilot Channel interference volume of IC signal correction, and reduce the amplitude of authentication signal.
Figure 10 is the flow chart according to IC verification process of the present invention.As shown in figure 10, the MUX operation comprises with the wheel stream mode and will arrive P-CPICH1 authentication subsystem 900 (step 1002) from each signal allocation of interdigital 314.In the present embodiment, at each N
OuterDistribute a new reference finger 314 to authenticate in the time slot.
As shown in FIG., next step proceeds VERIFICATION (authentication) operation, in this step, discern all and reference finger 314 corresponding interference signals (step 1006).900 pairs of all this interference signals of P-CPICH1 authentication subsystem are carried out the VERIFICATION operation, and this has just produced the N that the reference signal that purifies is measured
InnerThe RSCP value.In the present embodiment, be to carry out to the identification of interference signal with the edge that disturbs interdigital relevant time slot terminal point.Like this, every a N
InnerTime slot (adding/subtract corresponding interdigital timing offset amount) just is assigned to P-CPICH1 authentication subsystem 900 descrambling modules 904 (step 1006a) with disturbing interdigital 314 relevant scrambled codes, chip accumulator 908 reset (step 1006b).Chip accumulator 908 is collected the chip that is produced by descrambling module 904 then, and the generation of this chip utilizes the scrambled code of selected interference interdigital 314, response to finish at the descrambling (step 1006c) of the clean signal of special time groove.Afterwards, calculate and the corresponding RSCP of this time slot, and this RSCP is applied in VERIFICATION PARAMETER COMPUTATION (parameters for authentication calculating) program (will in following explanation) (step 1006d) according to the current contents of chip accumulator 908.If N
InnerThe RSCP value produces as yet, then be reset (step 1006b) and repeating step 1006c and 1006d of chip accumulator 908.Otherwise, beginning verification process (step 1006e).
Figure 10 is discussed, VERIFICATION PARAMETER COMPUTATION (parameters for authentication calculating) program (step 1010) is used for calculating the required various parameters of VERIFICATION operation implementation (step 1006) again.At step 1010a,, calculate the division factor relevant with each specific finger 314 by the RSCP content of P-CPICH1 signal available before and after the interference eliminated relatively.For example, consider this situation, wherein the VERIFICATION operation is suitable for determining that the pilot energy of second finger processor 314 (" #2 is interdigital ") is by the degree of first finger processor (" #1 is interdigital ") " seeing ".In the case, to comparing by the interdigital interior IC signal 440 of the interdigital generation of #2 and the output of authentication subsystem 900.If the latter is littler than IC signal 440 in interdigital interdigital of #2, change division factor to increase the size of interdigital the IC signal 520 that from the interdigital signal that receives of #1, deducts.Each division factor that newly calculates is stored in the authentication subsystem 900, and before upgrading again, is used in the ensuing authentication operation process (step 1010b).
Continue the VERIFICATION operation, confirm whether finish (step 1006f) about the step 1006a-e that disturbs selected interdigital 314 each the interdigital signal of current authentication.If do not finish as yet, the next one is carried out step 1006a-d according to the interdigital signal of interference that step 1002c discerns; Otherwise, whether confirm each interdigital 314 is finished VERIFICATION operation (step 1006g).
More than a plurality of embodiment of the present invention are illustrated.Yet, should be appreciated that under the situation that does not exceed scope of the present invention, can also do various modifications to the present invention.For example, method of the present invention can be realized by software or hardware, or realize by the combination of software and hardware.As another example, should be appreciated that the function of describing as the part of a module also can be realized by another equivalent module usually.Another example generally can also be finished in differing order with step or action that a particular order is described.In addition, the numerical value of Shuo Ming operation or execution parameter only is for example herein, under the situation that does not exceed the scope of the invention, can adopt other embodiment of different numerical value.Therefore, the purpose of more than describing the specific embodiment of the present invention is to explanation of the present invention and description.Above stated specification is not an exhaustive, or is not used in and limits the invention to disclosed precise forms, obviously, according to the above-mentioned instruction of the present invention, can make many modifications and variations.To the selection of embodiment and explanation is in order to illustrate principle of the present invention and practical application thereof best, thereby makes those skilled in the art can utilize the present invention best, and in order to be applicable to the special use of expection, can carry out various modifications to each embodiment.Scope of the present invention is by claim of the present invention and equivalent definition thereof.
Claims (10)
1, the method for reduce disturbing in a kind of band spread receiver, described band spread receiver comprise having N interdigital Rake receiver, and described N interdigital is used to N pilot signal handling N data-signal and be associated, and described method comprises:
Use described N pilot signal produce N interdigital in interference cancellation signals, described N interdigital in each and individual one of interdigital being associated of described N in the interference cancellation signals;
Each described N interdigital interior interference cancellation signals is weighted, to produce the interdigital interior interference cancellation signals of N weighting;
Synthetic N inter-finger interference cancellation, each in the described N inter-finger interference cancellation are one or more synthetic according in the interdigital interior interference cancellation signals of a described N weighting; And
From a described N data-signal, deduct each signal of a described N inter-finger interference cancellation in corresponding one, reduced the data-signal that disturbs thereby produce N;
Determine the described degree that has reduced residual interference in the data-signal that disturbs.
2, the method for claim 1 is wherein saidly determined with the wheel stream mode described N interdigital carrying out.
3, each in the individual interdigital interior interference cancellation signals of the method for claim 1, wherein described N is to produce according to one of described N data-signal that has reduced to disturb.
4, the method for claim 1, wherein produce N interdigital in interference cancellation signals further comprise and form N pilot channel model at least, individual one of interdigital being associated of each model of described N pilot channel model and described N.
5, the method for claim 1, wherein, a described N pilot signal comprises: N primary pilot signal and corresponding N are taught signal frequently, described generation also comprises N the primary pilot channel model of formation corresponding to a described N primary pilot signal, and teaches N guidance frequency channel model of signal frequently corresponding to described N.
6, a kind of band spread receiver comprises:
Have N interdigital Rake receiver, described N individual interdigital be used to handle N data-signal and N pilot signal that is associated, during described N is interdigital each is interdigital all comprise interdigital in interference cancellation module, described interdigital in interference cancellation module be configured to use in described N the relevant pilot signal at least one produce interdigital in interference cancellation signals; And inter-finger interference cancellation module, being used for synthetic N inter-finger interference cancellation, each in the described N inter-finger interference cancellation is synthetic according to one group of described interdigital interior interference cancellation signals, and described inter-finger interference cancellation module comprises:
Gain adjusting unit is used for the described interdigital interior interference cancellation signals of weighting, to produce the interdigital interior erasure signal of a plurality of weightings, reaches
Adder unit is used for merging each signal of interference cancellation signals in described a plurality of weightings interdigital;
The interference eliminated authentication ' unit is used for determining described N degree that has reduced residual interference in the data-signal that disturbs.
7, receiver as claimed in claim 6, wherein, each described interdigital interior interference cancellation module all comprises a subtrator, is used for one of described N inter-finger cancellation signal and one of described N data-signal are carried out subtraction, disturbs the data-signal that reduces thereby produce N.
8, receiver as claimed in claim 6, wherein, each described interdigital interior interference cancellation module all disposes the pilot channel processing module, to form the pilot channel model, each described interdigital interior interference cancellation signals is to produce according to one of a described pilot channel model and described N data-signal that has reduced to disturb.
9, receiver as claimed in claim 6, wherein, described interference eliminated authentication ' unit is provided for defining described N the interdigital described annoyance level in pass with the wheel stream mode.
10, receiver as claimed in claim 6, wherein, described interference eliminated authentication ' unit is configured to discern in the described N pilot signal each signal of the reception of disturbing the described data-signal of described N interdigital each in interdigital.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US40736302P | 2002-08-29 | 2002-08-29 | |
| US60/407,363 | 2002-08-29 |
Publications (2)
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| CN1703841A CN1703841A (en) | 2005-11-30 |
| CN100344073C true CN100344073C (en) | 2007-10-17 |
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| CNB038203588A Expired - Fee Related CN100344073C (en) | 2002-08-29 | 2003-08-26 | Adaptive pilot interference cancellation in CDMA systems |
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| US (2) | US7103094B2 (en) |
| EP (1) | EP1537680B1 (en) |
| CN (1) | CN100344073C (en) |
| AU (1) | AU2003270021A1 (en) |
| WO (1) | WO2004021581A2 (en) |
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| US7606295B2 (en) * | 2005-02-24 | 2009-10-20 | Interdigital Technology Corporation | Generalized rake receiver for wireless communication |
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| US8059739B2 (en) * | 2006-06-05 | 2011-11-15 | Telefonaktiebolaget Lm Ericsson | Method and apparatus for correcting data transmission errors |
| US20080069027A1 (en) * | 2006-09-20 | 2008-03-20 | Hongwei Kong | Method of interference cancellation in communication systems |
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| US7949366B2 (en) * | 2007-11-29 | 2011-05-24 | Broadcom Corporation | Diversity receiver system with interference cancellation and methods for use therewith |
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| US8559990B2 (en) * | 2010-02-05 | 2013-10-15 | Qualcomm Incorporated | Apparatus and method for enabling uplink beamforming transit diversity channel estimation |
| CN102195668B (en) * | 2010-03-12 | 2015-08-05 | 上海摩波彼克半导体有限公司 | The rake pin configuring management method of rake type receiver in mobile communication system performance boost |
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- 2003-08-26 CN CNB038203588A patent/CN100344073C/en not_active Expired - Fee Related
- 2003-08-26 WO PCT/US2003/026871 patent/WO2004021581A2/en not_active Application Discontinuation
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Also Published As
| Publication number | Publication date |
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| US7548580B2 (en) | 2009-06-16 |
| US20060233224A1 (en) | 2006-10-19 |
| US7103094B2 (en) | 2006-09-05 |
| WO2004021581A2 (en) | 2004-03-11 |
| AU2003270021A8 (en) | 2004-03-19 |
| EP1537680B1 (en) | 2012-03-07 |
| EP1537680A2 (en) | 2005-06-08 |
| US20040114674A1 (en) | 2004-06-17 |
| EP1537680A4 (en) | 2010-04-21 |
| CN1703841A (en) | 2005-11-30 |
| WO2004021581A3 (en) | 2004-12-23 |
| AU2003270021A1 (en) | 2004-03-19 |
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